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Make a couple of demos build using picolibc (#1202)

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* [RISC-V-Qemu-virt_GCC Demo] Add picolibc support

Add minimal picolibc support:

 * Use --specs=picolibc.specs to direct gcc at picolibc
 * Use -DPICOLIBC_INTEGER_PRINTF_SCANF to enable smaller printf implementation
 * Enable configUSE_PICOLIBC_TLS for thread local storage
 * Add TLS section to linker script

Signed-off-by: Keith Packard <keithpac@amazon.com>

* [CORTEX_MPU_M3_MPS2_QEMU_GCC Demo] Add picolibc support

Add minimal picolibc support to this demo

 * Use --specs=picolibc.specs to direct gcc at picolibc
 * Use -DPICOLIBC_INTEGER_PRINTF_SCANF to enable smaller printf implementation
 * Enable configUSE_PICOLIBC_TLS for thread local storage
 * Add TLS section to linker script
 * Replace newlib syscall hooks with picolibc ones

Signed-off-by: Keith Packard <keithpac@amazon.com>

---------

Signed-off-by: Keith Packard <keithpac@amazon.com>
Co-authored-by: Keith Packard <keithpac@amazon.com>
This commit is contained in:
Keith Packard 2024-04-02 21:43:14 -07:00 • committed by GitHub
parent 7514cd3d54
commit eb97c5d325
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GPG key ID: B5690EEEBB952194
7 changed files with 89 additions and 2 deletions
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4
FreeRTOS/Demo/RISC-V-Qemu-virt_GCC/FreeRTOSConfig.h
View file

@ -45,6 +45,10 @@
#define configMTIME_BASE_ADDRESS ( CLINT_ADDR + CLINT_MTIME )
#define configMTIMECMP_BASE_ADDRESS ( CLINT_ADDR + CLINT_MTIMECMP )
#ifdef PICOLIBC_TLS
#define configUSE_PICOLIBC_TLS 1
#endif
#define configUSE_PREEMPTION 1
#define configUSE_IDLE_HOOK 0
#define configUSE_TICK_HOOK 1

5
FreeRTOS/Demo/RISC-V-Qemu-virt_GCC/Makefile
View file

@ -43,6 +43,11 @@ else
CFLAGS += -O2
endif
ifeq ($(PICOLIBC), 1)
CFLAGS += --specs=picolibc.specs -DPICOLIBC_INTEGER_PRINTF_SCANF
LDFLAGS += --specs=picolibc.specs -DPICOLIBC_INTEGER_PRINTF_SCANF
endif
SRCS = main.c main_blinky.c riscv-virt.c ns16550.c \
$(DEMO_SOURCE_DIR)/EventGroupsDemo.c \
$(DEMO_SOURCE_DIR)/TaskNotify.c \

19
FreeRTOS/Demo/RISC-V-Qemu-virt_GCC/fake_rom.lds
View file

@ -81,6 +81,25 @@ SECTIONS
_edata = .;
} >ram AT>rom
.tdata : {
*(.tdata .tdata.*)
} >rom AT>rom
.tbss (NOLOAD) : {
*(.tbss .tbss.* .gnu.linkonce.tb.*)
*(.tcommon)
PROVIDE( __tbss_end = . );
PROVIDE( __tls_end = . );
} >rom AT>rom
PROVIDE( __tdata_source = LOADADDR(.tdata) );
PROVIDE( __tdata_source_end = LOADADDR(.tdata) + SIZEOF(.tdata) );
PROVIDE( __tdata_size = SIZEOF(.tdata) );
PROVIDE( __tbss_offset = ADDR(.tbss) - ADDR(.tdata) );
PROVIDE( __tbss_start = ADDR(.tbss) );
PROVIDE( __tbss_size = SIZEOF(.tbss) );
PROVIDE( __tls_size = __tls_end - ADDR(.tdata) );
PROVIDE( __tls_align = MAX(ALIGNOF(.tdata), ALIGNOF(.tbss)) );
.bss.align :
{
. = ALIGN(4);